switched blitbuffer to 4bpp (from 8bpp alpha + 8bpp gray)

this should allow to cache more, bigger pixmaps. We'll need this for
zoomed-in pages.

blitbuffer.c

@@ -21,7 +21,7 @@
 static int newBlitBuffer(lua_State *L) {
 	int w = luaL_checkint(L, 1);
 	int h = luaL_checkint(L, 2);
-	BlitBuffer *bb = (BlitBuffer*) lua_newuserdata(L, sizeof(BlitBuffer) + (w * h * BLITBUFFER_BYTESPP) - 1);
+	BlitBuffer *bb = (BlitBuffer*) lua_newuserdata(L, sizeof(BlitBuffer) + (w * h / 2) - 1);
 	luaL_getmetatable(L, "blitbuffer");
 	lua_setmetatable(L, -2);
 

blitbuffer.h

@@ -28,7 +28,6 @@ typedef struct BlitBuffer {
 	int h;
 	uint8_t data[1];
 } BlitBuffer;
-#define BLITBUFFER_BYTESPP 2
 
 int luaopen_blitbuffer(lua_State *L);
 

einkfb.c

@@ -126,16 +126,8 @@ static int blitFullToFrameBuffer(lua_State *L) {
 		return luaL_error(L, "blitbuffer size must be framebuffer size!");
 	}
 	
-	uint8_t *fbptr = (uint8_t*)fb->data;
-	uint32_t *bbptr = (uint32_t*)bb->data;
-
-	int c = fb->vinfo.xres * fb->vinfo.yres / 2;
+	memcpy(fb->data, bb->data, bb->w * bb->h / 2);
 
-	while(c--) {
-		*fbptr = (((*bbptr & 0x00F00000) >> 20) | (*bbptr & 0x000000F0)) ^ 0xFF;
-		fbptr++;
-		bbptr++;
-	}
 	return 0;
 }
 
@@ -177,14 +169,12 @@ static int blitToFrameBuffer(lua_State *L) {
 	uint8_t *fbptr = (uint8_t*)(fb->data + 
 			ydest * fb->finfo.line_length + 
 			xdest / 2);
-	uint32_t *bbptr = (uint32_t*)(bb->data +
-			yoffs * bb->w * BLITBUFFER_BYTESPP +
-			xoffs * BLITBUFFER_BYTESPP);
+	uint8_t *bbptr = (uint32_t*)(bb->data +
+			yoffs * bb->w / 2 +
+			xoffs / 2 );
 
 	for(y = 0; y < h; y++) {
-		for(x = 0; x < w; x++) {
-			fbptr[x] = (((bbptr[x] & 0x00F00000) >> 20) | (bbptr[x] & 0x000000F0)) ^ 0xFF;
-		}
+		memcpy(fbptr, bbptr, w);
 		fbptr += fb->finfo.line_length;
 		bbptr += (bb->w / 2);
 	}

pdf.c

@@ -227,7 +227,7 @@ static int drawPage(lua_State *L) {
 	rect.y0 = luaL_checkint(L, 5);
 	rect.x1 = rect.x0 + bb->w;
 	rect.y1 = rect.y0 + bb->h;
-	pix = fz_new_pixmap_with_rect_and_data(fz_device_gray, rect, bb->data);
+	pix = fz_new_pixmap_with_rect(fz_device_gray, rect);
 	fz_clear_pixmap_with_color(pix, 0xff);
 
 	ctm = fz_translate(-page->page->mediabox.x0, -page->page->mediabox.y1);
@@ -235,10 +235,10 @@ static int drawPage(lua_State *L) {
 	ctm = fz_concat(ctm, fz_rotate(page->page->rotate));
 	ctm = fz_concat(ctm, fz_rotate(dc->rotate));
 	ctm = fz_concat(ctm, fz_translate(dc->offset_x, dc->offset_y));
-	bbox = fz_round_rect(fz_transform_rect(ctm, page->page->mediabox));
 	dev = fz_new_draw_device(page->doc->glyphcache, pix);
 #ifdef USE_DISPLAY_LIST
 #ifdef MUPDF_TRACE
+	bbox = fz_round_rect(fz_transform_rect(ctm, page->page->mediabox));
 	fz_device *tdev;
 	tdev = fz_new_trace_device();
 	fz_execute_display_list(page->list, tdev, ctm, bbox);
@@ -246,6 +246,12 @@ static int drawPage(lua_State *L) {
 #endif
 	fz_execute_display_list(page->list, dev, ctm, bbox);
 #else
+#ifdef MUPDF_TRACE
+	fz_device *tdev;
+	tdev = fz_new_trace_device();
+	pdf_run_page(page->doc->xref, page->page, tdev, ctm);
+	fz_free_device(tdev);
+#endif
 	pdf_run_page(page->doc->xref, page->page, dev, ctm);
 #endif
 	if(dc->gamma >= 0.0) {
@@ -253,6 +259,18 @@ static int drawPage(lua_State *L) {
 	}
 	
 	fz_free_device(dev);
+
+	uint8_t *bbptr = (uint8_t*)bb->data;
+	uint32_t *pmptr = (uint32_t*)pix->samples;
+
+	int c = bb->w * bb->h / 2;
+
+	while(c--) {
+		*bbptr = (((*pmptr & 0x00F00000) >> 20) | (*pmptr & 0x000000F0)) ^ 0xFF;
+		bbptr++;
+		pmptr++;
+	}
+
 	fz_drop_pixmap(pix);
 
 	return 0;